Relay for burglar-alarm systems.



No. 892,158; PATENTED JUNE so, 1908. 0.JAGOBSON.

RELAY FOR BURGLAR ALARM SYSTEMS.

APPLICATION FILED NOV. 8, 1907.

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RELAY FOR BURGLAR ALARM SYSTEMS.

No. 892,158. v PATENTS-D JUNE 30, 1908.

' 0. JAGOBS'ON.

RELAY FOR BURGLAR ALARM SYSTEMS.

- APPLIOATION FILED NOV.8,1907.

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OLE JACOBSON,

OF CHICAGO, ILLINOIS, ASSIGNOR TO THE BANKERS ALARM-PROTECTION COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

RELAY FOR BURGLAR-ALARM SYSTEMS.

Specification of Letters Patent.

Patented June 30, 1908.

Application filed November 8, 1907. Serial No. 401,250.

To all whom it may concern:

Be it known that I, OLE JACOBSON, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvementsin Relays for Burglar-Alarm Systems, of which the following is a specification.

This invention relates to a relay for a closed circuit local burglar alarm system, and its object is to accomplish with a single instrument all of the results which have heretofore required the use of three separate and independent relays.

More specifically, the invention has for its object to provide a relay of novel construc tion in a closed circuit burglar alarm system whereby, with the single instrument, the alarm bell may be started ringing and kept ringing until stopped by the closing of the main circuit, all of which is accomplished with a single relay.

In the accompanying drawings illustrating the invention Figure 1 is a plan view of the relay, showing the boX in section and the parts in normal positions, the main circuit being closed and the alarm circuit open. Fig. 2 is a detail view. Fig. 3 is a view similar to Fig. 1 showing the alarm circuit closed and maintained by the main circuit. Fig. 4 is a sectional view on the line 44 of Fig. 3. Fig. 5 is a view similar to Fig. 1 showing a modi- 'fied form of my invention. Fig. 6 is a sectional view on the line 6-6 of Fig. 5.

The relay is inclosed within a boX 7 having a glass front 8, and it comprises two electromagnets 9, 10 supported on a base plate 11, and an armature 12 also supported on the saidbase and operating between the electromagnets. I The armature is carried by a pivot pin 13 which is pivotally mounted at one end 13 in the base and is held in upright position by an adjusting screw 14 which engages the other end of the pin. The adjusting screw operates through an interiorly threaded sleeve 15 which eXtends upward through a cross-piece 16 supported on posts 17 mounted on the base. A coil spring 18 has one end fastened to the pivot pin and its other end fastened to a projection 19 on the adjusting disk 20. This disk is held in adjusted position between the collar 15 on sleeve 15 and the cross-piece 16 by frictional engagement therewith. A threaded arm 21 projects from the pivot pin in alinement with the armature and on the opposite side of the pin and a weight 22 is adjustably mounted on said arm to balance the armature so that the relay may be used in any position. An adjustable contact 23 is mounted in a binding post 24 to be engaged by the armature and this post is insulated from the base and secured to the boX. The main circuit is a closed circuit and it comprises a wire 25 leading from the battery B to a binding post 26, a wire 27 to the magnet 9, a wire 28 to binding post 29, a wire 30 to binding post 31, a wire 32 to the magnet 10, a wire 33 to binding post 34 and a wire 35 to the battery. A switch 36 is arranged between wires 30 and 35 so that the electromagnet 10 may be shunted out of the main circuit and enable the return of the armature from the position shown in Fig. 3 to that shown in Fig. 1.

The local alarm circuit comprises a wire 37 leading from the battery B to binding post 38, a wire 39 connected to the base 11, a wire 40 connected to the binding post 24 and the binding post 41, a wire 42 leading from the binding post 41 to the battery and containing a bell 43. In the construction of Figs. 14 the electromagnets are located between the contact 23 and the pivot of the armature.

The construction shown in Figs. 5 and 6 differs from that shown in Figs. 14 in that the electromagnets are located on one side of the pivot of the armature and the contact on the other side. In this construction (Figs. 5 and 6) the arm 21 which carries the balance weight 22 constitutes a part of the armature and engages the contact.

In practice the relay is normally set in the position shown in Fig. 1 in which the armature is attracted to the main relay and switching electromagnet 9 to hold the alarm circuit open. When the main circuit is interfered with by being broken or otherwise the electromagnet 9 will release the armature and the spring will move the armature against the contact 23, thus closing the alarm circuit (Fig. 3) and sounding the alarm. If the interference in the main circuit is then removed the alarm circuit will be held closed by the maintaining electromagnet 10 because the electromagnets are both of the same strength and the electromagnet 10 will, because the armature is adjacent thereto and in cooperation with the spring, hold the armature against the contact 23. To return the armature to its normal position (Fig. 1) the switch 36 may be closed to shunt the electromagnet 10 out of circuit and then the electromagnet 9, having greater strength than the spring, will attract the armature.

What I claim and desire to secure by Letters Patent is:

1. A relay for a closed circuit burglar alarm system, comprising a closed main. circuit, an electromagnet in said main circuit, an armature normally attracted to said electromagnet, an open alarm circuit, a contact in said alarm circuit, a spring to more the armature against said contact when the main circuit is interfered with to close the alarm circuit, and another clectromagnet equal in strei'igth with the first mentioned electromagnet to coi'iperate with the. spring in holding the armature against said contact by the main circuit when the interl'erence in the main circuit is removed.

2. A relay for a closed circuit burglar alarm system, comprising a closed main circuit, a main relay and switching electromagnet in said main circuit, a maintaining electromagnet in said main circuit, an armature between said electmmagnets, an open alarm circuit, a contact in said alarm circuit, a spring to more the armature against said contact when the main circuit is interfered with to close the alarm circuit, and a switch in the main circuit to shunt out the maint'aining electromagnet when the interference in the main circuit is removed.

3. A relay for a closed circuit burglar alarm system comprising a main circuit, two electromagnets of equal strength in said. main circuit, an armature pivotally mounted to 0 perate between said. electromagnets and normally attracted to one of them, an open alarm circuit, a contact in. said alarm circuit, and a spring for moving the armature away from the electromagnet to which it is attracted normally and against said contact to close the alarm circuit and in adjacent relation to the other electromagnet when the main circuit is interlereril with, said other electromagnet being adapted to hold the armature against the contact and Keep the alarm cireuit closed it the intcrl'ermce in the main circuit is removed.

1-. A relay l'or a closed circuit burglar alarm system, conmrising a metal base, a contact mounted on the base and insulated therefrom, an open alarm circuit including said hase and contact, a closed main circuit, a pair of clectromagnets in said main circuil, a pivot pin mounted in the base, an armature on said pin and operating between. the electron'iagnets, a spring for moring the armature against the contact when the main cireuit is interl errul with to close the alarm circuit, an arm on the pivot pin projecting in alinement with the armature and on the opposite side of the pin,a weight adjustahly mounted on said arm, and a switch in the main. circuit.

()Lil JAUOBSON. lVitncsses:

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